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Mesoscale Discussion 326 |
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MESOSCALE DISCUSSION 0326
NWS STORM PREDICTION CENTER NORMAN OK
1135 AM CDT FRI APR 01 2016
AREAS AFFECTED...SE LA
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 011635Z - 011900Z
PROBABILITY OF WATCH ISSUANCE...40 PERCENT
SUMMARY...A SEVERE THREAT IS EXPECTED TO IMPACT SERN LA WHERE
ISOLATED LARGE HAIL AND WIND DAMAGE WILL BE POSSIBLE EARLY THIS
AFTERNOON. WW ISSUANCE MAY BE NEEDED.
DISCUSSION...LATEST SFC ANALYSIS SHOWS A COLD FRONT EXTENDING FROM
SW AL SWWD INTO SERN LA AND THE COASTAL WATERS. SOUTH OF THE
FRONT...A MOIST AIRMASS IS IN PLACE WITH SFC DEWPOINTS IN THE MID
60S TO LOWER 70S. THIS IS CONTRIBUTING TO MODERATE INSTABILITY
EVIDENT ON THE 12Z NEW ORLEANS SOUNDING. IN ADDITION...THE NEW
ORLEANS WSR-88D VWP SHOWS STRONG DEEP-LAYER SHEAR OF 75 TO 80 KT AND
A 700 TO 500 MB LAPSE RATE OF 7.0 C/KM. THIS ENVIRONMENT WILL
SUPPORT SUPERCELL DEVELOPMENT ACROSS SE LA EARLY THIS AFTERNOON. A
SUPERCELL IS ALREADY ONGOING JUST OFFSHORE ABOUT 75 MILES SOUTHWEST
OF NEW ORLEANS. THIS CELL SHOULD REMAIN SUSTAINED AS IT MOVES
INLAND...ENEWD ALONG THE GRADIENT OF INSTABILITY. LARGE HAIL AND
WIND DAMAGE WILL BE POSSIBLE AS THIS CELL MOVES ACROSS SE LA OVER
THE NEXT FEW HOURS.
..BROYLES/HART.. 04/01/2016
ATTN...WFO...LIX...LCH...
LAT...LON 28999012 28939066 29159126 29409164 29809129 30138973
29878937 29398930 29078981 28999012
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